We report an unexpected route for synthesizing pyrrole-fused dibenzoxazepines/thiazepines with high chemoselectivity via a pseudo-Joullié–Ugi reaction from cyclic imines with isocyanides and acetylenedicarboxylates under catalyst-free conditions.
An efficient visible-light-induced Staudinger [2 + 2] annulation reaction under catalyst-free conditions has been established, and tetracyclic dibenzo[b,f][1,4]oxazepine/thiazepine-fused β-lactams were synthesized with a broad substrate scope and high efficiency (37 examples, up to >99% yield).
The Truce–Smiles rearrangement is a powerful method for functionalizing aromatic compounds, enabling the synthesis of various (hetero)aromatic groups. This work summarizes recent advancements in this area.
Rigidified heterocycles encompassing two dibenzo[b,f]oxazepine scaffolds and a 1,4-dihydropyrrolo[3,2-b]pyrrole core show intense blue emission and low turn-on voltage (≈3.5 V) in OLED devices.
An unprecedented radical smiles rearrangement of N-arylpropiolamides was realized by merging electro-reduction with hydrogen bonding activation. Enabled by this dual activation strategy, the reduction potential was shifted positively by 218 mV.